HELP! 4WD Light&Check Engine Light

[JHereth22]

Recently the 4wd light has come on with the check engine light. Along with the overdrive light flashes for a few seconds when i start the SUV.
I thought it was the battery, so i had that replaced today. The lights did go away, but i drove to work and they came back on..
It is a 99 QX4, with 175k on it. This isn't my DD but is my bad weather vehicle... Any ideas? Nissan had it for 5 hours and couldn't find anything wrong expect a bad battery...
HELP ME

[JHereth22]

[atraudes]

Try the suggestions here to see if anything catches for you.

Let us know how it turns out!

[JHereth22]

Ran diagnostics on it....
4wd light blinked 14 times...
Which means Throttle Position Circuit is shorted or open.
Ideas?

[atraudes]

Start running through the diagnostic steps for the throttle position sensor, starting on page AT-160.

The good news is that the TPS isn't terribly expensive if you end up having to replace it.

[JHereth22]

Will do!

[JHereth22]

In all honesty i think i should just replace it.

[atraudes]

Some of the steps are pretty quick if you have a voltage meter. I'd hate to see you drop $50 if that isn't the problem! Though if time and warmth are at a premium at the moment, I can't say I wouldn't do differently

[JHereth22]

Haha I wouldn't normally care to diagnose, but I'm in Missouri... Cold
And I've got the G on stilts waiting on these coilovers, but on CL i found a 97 pathfinder wrecked... But he will sell me the TPS for $20

[JHereth22]

Update. Bought the TPS off a 97 Pathfinder. Put it on and Check Engine light went away!
Time for some offroading

[atraudes]

cheers to that!